Electrocatalysis device and method for promoting synthesis of peracetic acid by using anode oxygen

Abstract

The invention discloses an electro-catalysis device for promoting peracetic acid synthesis by using anode oxygen and a process method, and relates to the technical field of peracetic acid synthesis. Comprising a cathode cover plate, a gas runner chamber, a cathode chamber, an anode chamber and an anode cover plate which are arranged in sequence, a gas diffusion electrode is adopted as a cathode, a rhombic titanium mesh coated with IrO2 is adopted as an anode electrode, the gas diffusion electrode is located between the gas runner chamber and the cathode chamber, the anode electrode is located between the cathode chamber and the anode chamber, and the anode cover plate is located between the cathode chamber and the anode chamber. A proton exchange membrane is arranged between the anode electrode and the cathode chamber, an anion exchange membrane is arranged between the gas diffusion electrode and the cathode chamber, and the gas diffusion electrode and the anode electrode extend to the outside through a copper adhesive tape. According to the method, the electro-catalysis device is constructed, high-concentration hydrogen peroxide on a catalyst interface is utilized, and oxygen generated by excavating the anode is used as a source of cathode oxygen, so that the yield of the peracetic acid is greatly increased, and in-situ generation of the peracetic acid and excavation of the oxygen generated by the anode are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of peracetic acid synthesis, and particularly to an electrocatalytic device and a process method for promoting the synthesis of peracetic acid by anodic oxygen. Background Art

[0002] Peracetic acid (CH3COOOH, also known as PAA), as a kind of organic peroxide with strong oxidation activity, has attracted much attention in the fields of organic synthesis and industrial applications since the mid-20th century due to its unique chemical properties. Its molecular structure is composed of an acetyl group directly connected to a peroxyhydroxyl group. This simple structural feature endows it with both high reactivity and controllability, showing significant regioselectivity and stereoselectivity in epoxidation reactions, and is widely used in the catalytic conversion processes of olefin epoxidation to synthesize epoxides and cyclic ester compounds. This oxidation system follows the principles of green chemistry, with mild reaction conditions (room temperature and atmospheric pressure), and the by-products are only recyclable acetic acid, water and oxygen, meeting the core requirements of contemporary chemical industry for clean production. It is worth noting that recent research has found that its low-concentration solution of 1 ppm can achieve broad-spectrum microbial inactivation, which significantly enhances its application value in the fields of medical device disinfection, food processing sterilization and environmental treatment.

[0003] Currently, the industrial synthesis of peracetic acid mainly adopts the hydrogen peroxide acylation method, and its reaction mechanism is that the nucleophilic oxygen atom of the peroxy group in the hydrogen peroxide (H2O2) molecule undergoes an acyl transfer reaction with acetic acid (CH3COOH). This process usually uses sulfuric acid as a proton acid catalyst, and a peracetic acid solution with a concentration of 15 - 30 wt% can be obtained by adjusting the concentration of H2O2 (≥30 wt%). Although this method has technical advantages such as simple reaction equipment and controllable operation parameters, there are two key limiting factors: firstly, the cost of high-purity H2O2 raw materials accounts for more than 60% of the total production cost; secondly, restricted by chemical equilibrium, the conversion rates of acetic acid and H2O2 are usually low, and it takes 8 - 24 hours to reach the reaction equilibrium, resulting in low space-time yield.

[0004] Electrochemical synthesis technology provides a new way to break through the bottleneck of traditional processes. By in-situ generating H2O2 through the cathodic oxygen reduction reaction (ORR), the raw material cost can be effectively reduced. The two-electron ORR path (O2 + 2H + + 2e -The Faraday efficiency for →H2O2 can reach over 90%, which lays an electrochemical foundation for the continuous production of H2O2. However, the existing electrochemical systems face three challenges: 1) The concentration of H2O2 in the cathode region is limited by mass transfer and difficult to break through, making it difficult to meet the kinetic requirements of the acylation reaction; 2) The oxygen generated by the anodic oxygen evolution reaction (OER) is not effectively utilized, resulting in waste of resources and safety risks; 3) The interfacial contact efficiency between H2O2 and acetic acid in the multiphase reaction system is insufficient, leading to a low overall reaction conversion rate.

[0005] In recent years, some patents for the in-situ generation of peracetic acid through electrochemical methods have emerged. For example, the invention patent with the publication number CN118292001A and the name of a process for electrocatalytic in-situ oxidation synthesis of peracetic acid based on a stacked electrolytic cell device uses acetic acid as the reaction substrate. Under constant current conditions, a stacked electrolytic cell reaction device is used, and by additionally providing oxygen, the H2O2 in-situ generated by coupling the oxygen reduction reaction occurring at the cathode gas diffusion electrode is used to generate peracetic acid. The reaction substrate acetic acid and tap water are mixed in a certain proportion as the cathode electrolyte, and the cathode liquid circulates between the cathode liquid storage tank and the cathode chamber through a pump, while the low-concentration acidic solution circulates between the anode chamber and the anode storage tank through a pump. By using a stacked electrolytic cell device and the in-situ generated hydrogen peroxide as an oxidation medium, acetic acid is successfully converted into peracetic acid, effectively solving the technical problems such as high cost, safety and environmental issues, low reaction efficiency, and long production cycle faced in the current preparation of peracetic acid.

[0006] For example, the utility model patent with the announcement number CN222139304U and the name of a bionic blade flow electrolytic cell device for efficient electrocatalytic production of peracetic acid reduces the turbulent dead zone and enhances mass transfer by using the cavities of bionic blades in the liquid plates of the cathode and anode and the cathode gas chamber plate; the cathode is a gas diffusion electrode, and between the cathode liquid chamber plate and the hollow baffle, additional supplied oxygen is used for the oxygen reduction reaction to achieve the generation of peracetic acid.

[0007] The above patents use an electrolytic cell device and a gas diffusion electrode to generate in-situ H2O2 and then react with acetic acid to produce peracetic acid. However, the above solutions still have two major defects: (1) The defect of not maximizing the utilization of the oxygen in-situ generated at the anode as the cathode reactant (O2) leads to a low concentration of the generated H2O2, and further to a low concentration of peracetic acid; (2) The characteristic that a high concentration of H2O2 can be generated at the GDE (gas diffusion electrode) interface is not used to promote the generation of peracetic acid. Summary of the Invention

[0008] The main purpose of the present invention is to provide an electrocatalytic device and process for promoting the synthesis of peracetic acid by using anode oxygen to overcome the problems existing in the prior art.

[0009] To solve the above technical problems, the present invention adopts the following technical solutions:

[0010] An electrocatalytic device for promoting the synthesis of peracetic acid by using anodic oxygen includes a cathode cover plate, a gas flow channel chamber, a cathode chamber, an anode chamber, and an anode cover plate arranged in sequence. The cathode uses a gas diffusion electrode, and the anode electrode uses a rhombic titanium mesh coated with IrO2. The gas diffusion electrode is located between the gas flow channel chamber and the cathode chamber, and the anode electrode is located between the cathode chamber and the anode chamber. A proton exchange membrane is provided between the anode electrode and the cathode chamber, and an anion exchange membrane is provided between the cathode electrode and the cathode chamber. The gas diffusion electrode and the anode electrode extend to the outside through copper tape and are connected to a power supply.

[0011] Furthermore, corresponding fixed rod holes are provided on the cathode cover plate, the gas flow channel chamber, the cathode chamber, the anode chamber, and the anode cover plate, and a fixed rod is used to pass through the fixed rod holes for connection.

[0012] Furthermore, the cathode chamber adopts a narrow cathode chamber or a wide cathode chamber.

[0013] Furthermore, an air inlet outer end and an air outlet outer end are provided on the cathode cover plate.

[0014] Furthermore, an air inlet inner end and an air outlet inner end are provided on the gas flow channel chamber. The air inlet outer end is connected to the air inlet inner end through a half-through plate, and the air outlet outer end is connected to the air outlet inner end through a half-through plate.

[0015] Furthermore, an electrolyte inlet and an electrolyte outlet are provided on both the narrow cathode chamber and the wide cathode chamber.

[0016] Furthermore, an anodic electrolyte inlet, an anodic electrolyte outlet, and an anodic gas outlet are provided on the anode cover plate. The anodic electrolyte inlet, the anodic electrolyte outlet, and the anodic gas outlet are all connected to the anode chamber through half-through plates.

[0017] An electrocatalytic process method for promoting the synthesis of peracetic acid by using anodic oxygen includes the following steps:

[0018] Before in-situ generating peracetic acid, use a fixed rod to combine the cathode cover plate, the gas flow channel chamber, the cathode chamber, the anode chamber, and the anode cover plate through the fixed rod holes. The gas diffusion electrode and the anode electrode extend to the outside through copper tape, and a DC power supply is applied by clamping the copper tape with a stainless steel alligator clip.

[0019] An acetic acid solution continuously flows into the cathode chamber. After flowing in from the electrolyte inlet, it passes through the flow channels in the cathode chamber and then flows out from the electrolyte outlet. After the sulfuric acid solution flows in from the anode electrolyte inlet, it flows out from the anode electrolyte outlet;

[0020] After applying a DC power supply, oxygen bubbles will continuously form on the surface of the anode electrode in the anode chamber and disperse to the surface of the sulfuric acid solution, and then flow out through the anode gas outlet and into the inner end of the air inlet in the gas flow channel chamber through a pipeline. At the same time, in the presence of oxygen, the cathode gas diffusion electrode will undergo an oxygen reduction reaction to produce alkaline H2O2. The alkaline H2O2 generated on the surface of the gas diffusion electrode accumulates at the interface between the catalytic layer and the contacting electrolyte and migrates across the membrane into the electrolyte;

[0021] Among them, the oxygen reduction reaction is specifically O2 + 2H + + 2e - → H2O2. A low-concentration acetic acid solution with a concentration of 1 - 3 mol / L is used in the narrow or wide cathode chamber, and a low-concentration sulfuric acid solution with a concentration of 0.5 - 1 mol / L is used in the anode chamber.

[0022] Furthermore, an anode chamber liquid storage tank, a product liquid storage tank, a product pump, and an anode chamber circulation pump are additionally provided. The product pump enables the acetic acid in the cathode chamber to circulate rapidly or flow continuously slowly, increasing the concentration of peracetic acid in the solution. The anode chamber circulation pump continuously adds electrolyte to the anode chamber to prevent the liquid level from dropping due to long-term electrolysis.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) It realizes the synchronous coupling of the electrocatalytic production of H2O2 reaction and the acylation reaction in an electrocatalytic device, in-situ generates peracetic acid, and efficiently utilizes the H2O2 concentration gradient existing at the GDE catalyst interface. On the one hand, it can improve the synthesis efficiency, and on the other hand, it can save the time for generating peracetic acid in the acylation reaction;

[0025] 2) It realizes the in-depth exploration of the oxygen source. The oxygen generated by the anodic oxygen evolution reaction can reduce or eliminate the need to use additional oxygen, reducing the synthesis cost and making the reaction safer;

[0026] 3) The narrow cathode chamber designed in this process utilizes the H2O2 concentration gradient phenomenon at the catalyst interface to increase the H2O2 concentration during the reaction, which is more conducive to the formation of the product peracetic acid;

[0027] 4) This process is easy to implement and can continuously generate peracetic acid in-situ for a long time. Brief Description of the Drawings

[0028] Figure 1Schematic diagram of the electrocatalytic device combination of the present invention.

[0029] Figure 2 Schematic diagram of the cathode cover plate structure of the present invention.

[0030] Figure 3 Schematic diagram of the gas flow channel chamber structure of the present invention.

[0031] Figure 4 Schematic diagram of the narrow cathode chamber structure of the present invention.

[0032] Figure 5 Schematic diagram of the wide cathode chamber structure of the present invention.

[0033] Figure 6 Schematic diagram of the anode chamber structure of the present invention.

[0034] Figure 7 Schematic diagram of the anode cover plate structure of the present invention.

[0035] Figure 8 Variation curve of peracetic acid concentration generated by the narrow cathode chamber and the wide cathode chamber of the present invention over time.

[0036] Explanation of reference numerals: 1. Cathode cover plate; 1a. Outer end of the air inlet; 1b. Outer end of the air outlet; 1c. Inner end of the air inlet; 1d. Inner end of the air outlet; 2. Gas flow channel chamber; 3. Narrow cathode chamber; 3a. Electrolyte inlet; 3b. Electrolyte outlet; 4. Wide cathode chamber; 5. Anode chamber; 6. Anode cover plate; 6a. Anode electrolyte inlet; 6b. Anode electrolyte outlet; 6c. Anode gas outlet. 7. Gas diffusion electrode; 8. Proton exchange membrane; 9. Anode electrode; 10. Anion exchange membrane; 11. Fixed rod hole position. Detailed implementation mode

[0037] The technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0038] Embodiment 1

[0039] Combined with Figures 1 to 7 , this embodiment provides an electrocatalytic device for promoting the synthesis of peracetic acid by using anode oxygen, including a cathode cover plate 1, a gas flow channel chamber 2, a cathode chamber, an anode chamber 5, and an anode cover plate 6 arranged in sequence. The cathode uses a gas diffusion electrode 7, the anode electrode 9 uses a rhombic titanium mesh coated with IrO2. The gas diffusion electrode 7 is located between the gas flow channel chamber 2 and the cathode chamber, the anode electrode 9 is located between the cathode chamber and the anode chamber 5, a proton exchange membrane 8 is provided between the anode electrode 9 and the cathode chamber, an anion exchange membrane 10 is provided between the gas diffusion electrode 7 and the cathode chamber, and the gas diffusion electrode 7 and the anode electrode 9 extend to the outside through a copper tape and are connected to a power supply.

[0040] Specifically, the cathode chamber adopts a narrow cathode chamber 3 or a wide cathode chamber 4.

[0041] In this embodiment, corresponding fixed rod holes 11 are provided on the cathode cover plate 1, the gas flow channel chamber 2, the cathode chamber, the anode chamber 5, and the anode cover plate 6, and the connection is made by passing a fixed rod through the fixed rod holes 11.

[0042] In this embodiment, an outer end 1a of the air inlet and an outer end 1b of the air outlet are provided on the cathode cover plate 1. An inner end 1c of the air inlet and an inner end 1d of the air outlet are provided on the gas flow channel chamber 2. The outer end 1a of the air inlet is connected to the inner end 1c of the air inlet through a half-through plate, and the outer end 1b of the air outlet is connected to the inner end 1d of the air outlet through a half-through plate.

[0043] In this embodiment, an electrolyte inlet 3a and an electrolyte outlet 3b are provided on both the narrow cathode chamber 3 and the wide cathode chamber 4.

[0044] In this embodiment, an anode electrolyte inlet 6a, an anode electrolyte outlet 6b, and an anode gas outlet 6c are provided on the anode cover plate 6. The anode electrolyte inlet 6a, the anode electrolyte outlet 6b, and the anode gas outlet 6c are all connected to the anode chamber 5 through half-through plates.

[0045] Example 2

[0046] This embodiment provides an electrocatalytic process method for promoting peracetic acid synthesis by using anode oxygen. Based on the above device, it includes the following steps:

[0047] Before in-situ generating peracetic acid, use a fixed rod to combine the cathode cover plate 1, the gas flow channel chamber 2, the cathode chamber, the anode chamber 5, and the anode cover plate 6 through the fixed rod holes 11. The gas diffusion electrode 7 and the anode electrode 9 are extended to the outside through copper tape, and the application of a DC power supply is achieved by clamping the copper tape with a stainless steel alligator clip;

[0048] An acetic acid solution is continuously introduced into the cathode chamber. The acetic acid solution flows in from the electrolyte inlet 3a, passes through the cathode chamber flow channel, and then flows out from the electrolyte outlet 3b. After the sulfuric acid solution flows in from the anode electrolyte inlet 6a, it flows out from the anode electrolyte outlet 6b;

[0049] After applying the DC power supply, oxygen bubbles will continuously be generated on the surface of the anode electrode 9 in the anode chamber 5 and escape to the surface of the sulfuric acid solution, and then flow out through the anode gas outlet 6c and into the inner end 1c of the air inlet in the gas flow channel chamber 2 through a pipeline. At the same time, in the presence of oxygen, the cathode gas diffusion electrode will undergo an oxygen reduction reaction to generate alkaline H2O2. The alkaline H2O2 generated on the surface of the gas diffusion electrode accumulates at the interface between the catalytic layer and the contacting electrolyte and migrates across the membrane into the electrolyte;

[0050] Therefore, compared with the overall electrolyte of the catalyst / interface electrolyte, the product concentration in this interfacial region is several orders of magnitude higher than the average concentration evenly dispersed in the electrolyte, and the concentration gradient will quickly disappear when the product flows out. It can be seen from this equation that CH3COOH + H2O2 → CH3COOOH + H2O. A high concentration of H2O2 is beneficial to promoting the formation of peracetic acid. Therefore, compared with the mode of electrochemically synthesizing H2O2 first and then reacting with acetic acid, this process makes full use of the high interfacial concentration of H2O2 to accelerate the possibility of generating peracetic acid.

[0051] Among them, the oxygen reduction reaction is specifically O2 + 2H + + 2e - → H2O2. A low-concentration acetic acid solution with a concentration of 1-3 mol / L is used in the narrow cathode chamber 3 or the wide cathode chamber 4, and a low-concentration sulfuric acid solution with a concentration of 0.05-1 mol / L is used in the anode chamber 5.

[0052] In this embodiment, the diamond-shaped titanium mesh used for the anode electrode 9 is prepared by the calcination impregnation method, and its loading amount is 15 g / m 2 . The cathode uses a gas diffusion electrode 7, and the material of the gas diffusion electrode 7 includes conductive carbon black, polytetrafluoroethylene, and ethanol. Among them, the conductive carbon black selected is XC72. The mass ratio of conductive carbon black, polytetrafluoroethylene, and ethanol is 5:2:1.

[0053] In a further embodiment, in order to achieve the long-term production of peracetic acid, an anode chamber liquid storage tank, a product liquid storage tank, a product pump, and an anode chamber circulation pump are additionally provided. The product pump enables the acetic acid in the cathode chamber to circulate rapidly or flow slowly continuously, increasing the concentration of peracetic acid in the solution. The anode chamber circulation pump continuously adds electrolyte to the anode chamber 5 to prevent the liquid level from dropping due to long-term electrolysis.

[0054] Electrochemical synthesis of H2O2 usually requires additional oxygen as a reactant. After adopting the process method of using the in-situ generated oxygen to synthesize peracetic acid with the electrocatalytic device proposed by the present invention, the use of oxygen can be reduced or eliminated, and part of the air can also be used as a substitute. The operation results show that without additional use of oxygen and under the condition of a current density of 10 mA / cm 2 , the peracetic acid production is still 74.6% of that when using oxygen completely. If an additional 10 mL / min of air is supplied as a partial oxygen source, the peracetic acid production can reach 93.9% of that when using oxygen.

[0055] The mode of reacting with acetic acid after electrochemically synthesizing H2O2 has the problem of low concentration of peracetic acid formation (that is, the mode of first generating H2O2 by an electrochemical method and then mixing it with acetic acid to undergo an acylation reaction to generate peracetic acid). The process method of in-situ synthesizing peracetic acid by using oxygen with the electrocatalytic device proposed in the present invention (in the present invention, H2O2 is generated in-situ electrochemically and peracetic acid is generated through an interfacial reaction, which is equivalent to improving from a two-step method to a one-step method) can effectively utilize the high H2O2 concentration existing in the catalyst / interface to generate peracetic acid. By directly collecting H2O2 on the electrode surface and measuring its concentration by potassium titanate oxalate spectrophotometry, the concentration is 6000 mg / L, while the average concentration of H2O2 at this time is only 647 mg / L. It is equivalent to undergoing an acylation reaction under a higher concentration of H2O2, thereby significantly increasing the concentration of the generated peracetic acid. The operation results show that, compared with the traditional two-step peracetic acid synthesis method, the process method involved in this device can effectively improve the synthesis efficiency of peracetic acid by 160.7%.

[0056] Example 3

[0057] To verify that a narrow cathode chamber can more effectively promote mass transfer, a narrow cathode chamber 3 and a wide cathode chamber 4 were respectively used as the cathode chamber. A 100 mL 2M acetic acid solution was circulated in the cathode chamber at a circulation flow rate of 30 mL / min, and a 100 mL 1M sulfuric acid solution was circulated in the anode chamber 5 at a circulation flow rate of 30 mL / min; the current density applied by the DC power supply was 10 mA / cm 2 , and the concentration of the synthesized peracetic acid was detected by liquid chromatography (according to application number CN116559342A). The change curves of the peracetic acid concentration generated by the narrow cathode chamber 3 and the wide cathode chamber 4 over time are as Figure 8 shown.

[0058] It is significantly found that the narrow cathode chamber can generate a higher concentration of peracetic acid. This is mainly because at the same flow rate, a narrow middle chamber with a width of 0.3 cm can have a faster flow rate, and the mass transfer of H + is also more rapid, thus being able to more effectively catalyze the synthesis of peracetic acid.

[0059] As can be seen from the above three embodiments, the previous electrochemical method only mentioned that peracetic acid can be effectively electro-synthesized, without utilizing the interfacial theory of catalysts and without exploring the source of oxygen supply. The reaction device and method designed in the present invention are different from the prior art. The device and method can generate peracetic acid more effectively and can achieve the following effects: synchronously coupling the electrochemical production of H2O2 reaction with the acylation reaction, in-situ production of peracetic acid can be realized. On the one hand, the synthesis efficiency can be improved, with an in-situ increase of 160.7% in the synthesis efficiency. On the other hand, the time for the acylation reaction to generate peracetic acid can be saved, usually requiring 24 hours; the deep exploration of the oxygen source is realized. The oxygen generated by the oxygen evolution reaction at the anode can reduce or eliminate the need for additional oxygen, greatly reducing the cost and making the reaction safer; this process effectively utilizes the concentration gradient at the catalyst interface, making the concentration of the reactant H2O2 higher, which is more conducive to the formation of the product peracetic acid; this process is easy to implement and can continuously generate peracetic acid in-situ.

[0060] The present invention is not limited to a certain type of gas diffusion electrode, but only an electrode that can utilize oxygen to produce H2O2; it is not limited to a certain concentration, and the concentrations of acetic acid and sulfuric acid can be 1 - 3M and 0.5 - 1M respectively. Acetic acid is the reactant, and the acidity of sulfuric acid mainly plays a catalytic role; it is not limited to a certain flow rate, which mainly plays a role in mass transfer; if it is a circulating flow, the flow rate can be 0.5 - 50 mL / min, and if it is a continuous flow, it can be 0.5 - 1 mL / min; it is not limited to a certain narrow size of the cathode chamber, which mainly promotes the acylation reaction at the catalyst interface: the specific thickness can be 0.2 - 0.5 cm.

[0061] The above is only a preferred embodiment of the present invention, and it does not impose any limitation on the technical scope of the present invention. Therefore, any minor modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An electrocatalytic device for promoting the synthesis of peracetic acid by using anodic oxygen, characterized in that, It includes a cathode cover plate (1), a gas flow channel chamber (2), a cathode chamber, an anode chamber (5) and an anode cover plate (6) arranged in sequence. The cathode uses a gas diffusion electrode (7), and the anode electrode (9) uses a rhombic titanium mesh coated with IrO2. The gas diffusion electrode (7) is located between the gas flow channel chamber (2) and the cathode chamber, and the anode electrode (9) is located between the cathode chamber and the anode chamber (5). A proton exchange membrane (8) is provided between the anode electrode (9) and the cathode chamber, and an anion exchange membrane (10) is provided between the gas diffusion electrode (7) and the cathode chamber. The gas diffusion electrode (7) and the anode electrode (9) extend to the outside through copper tape and are connected to a power supply.

2. The electrocatalytic device for promoting the synthesis of peracetic acid by using anodic oxygen as claimed in claim 1, wherein Corresponding fixed rod holes (11) are provided on the cathode cover plate (1), the gas flow channel chamber (2), the cathode chamber, the anode chamber (5) and the anode cover plate (6), and they are connected by passing a fixed rod through the fixed rod holes (11).

3. An electrocatalytic device for promoting the synthesis of peracetic acid by using anodic oxygen as claimed in claim 1, characterized in that, The cathode chamber uses a narrow cathode chamber (3) or a wide cathode chamber (4).

4. The electrocatalytic device for promoting peracetic acid synthesis by using anodic oxygen as claimed in claim 1, wherein, An air inlet outer end (1a) and an air outlet outer end (1b) are provided on the cathode cover plate (1).

5. An electrocatalytic device for promoting peracetic acid synthesis by using anodic oxygen as claimed in claim 4, characterized in that, An air inlet inner end (1c) and an air outlet inner end (1d) are provided on the gas flow channel chamber (2). The air inlet outer end (1a) and the air inlet inner end (1c) are connected by a half-through plate, and the air outlet outer end (1b) and the air outlet inner end (1d) are connected by a half-through plate.

6. The electrocatalytic device for promoting peracetic acid synthesis by using anodic oxygen according to claim 3, characterized in that, An electrolyte inlet (3a) and an electrolyte outlet (3b) are provided on both the narrow cathode chamber (3) and the wide cathode chamber (4).

7. An electrocatalytic device for promoting the synthesis of peracetic acid by using anodic oxygen as claimed in claim 1, characterized in that, An anode electrolyte inlet (6a), an anode electrolyte outlet (6b) and an anode gas outlet (6c) are provided on the anode cover plate (6). The anode electrolyte inlet (6a), the anode electrolyte outlet (6b) and the anode gas outlet (6c) are all connected to the anode chamber (5) by half-through plates.

8. An electrocatalytic process for promoting the synthesis of peracetic acid using anodic oxygen, based on the device described in any one of the above claims 1-7, characterized in that, It includes the following steps: Before in-situ generating peracetic acid, use a fixed rod to combine the cathode cover plate (1), the gas flow channel chamber (2), the cathode chamber, the anode chamber (5) and the anode cover plate (6) through the fixed rod holes (11). The gas diffusion electrode (7) and the anode electrode (9) extend to the outside through copper tape, and a DC power supply is applied by clamping the copper tape with a stainless steel alligator clip. An acetic acid solution is continuously introduced into the cathode chamber. After flowing in from the electrolyte inlet (3a), it flows through the cathode chamber flow channel and then flows out from the electrolyte outlet (3b). After the sulfuric acid solution flows in from the anode electrolyte inlet (6a), it flows out from the anode electrolyte outlet (6b). After applying a DC power supply, oxygen bubbles will continuously be generated on the surface of the anode electrode (9) in the anode chamber (5), dissipate to the surface of the sulfuric acid solution, and then flow out through the anode gas outlet (6c) and into the inner end (1c) of the air inlet in the gas flow channel chamber (2). At the same time, in the presence of oxygen, the cathode gas diffusion electrode will undergo an oxygen reduction reaction to produce alkaline H2O2. The alkaline H2O2 generated on the surface of the gas diffusion electrode accumulates at the interface between the catalytic layer and the contacting electrolyte and migrates across the membrane into the electrolyte; Among them, the oxygen reduction reaction is specifically O2 + 2H + + 2e - → H2O2. A low-concentration acetic acid solution with a concentration of 1-3 mol / L is used in the narrow cathode chamber (3) or the wide cathode chamber (4), and a low-concentration sulfuric acid solution with a concentration of 0.05-1 mol / L is used in the anode chamber (5).

9. The electrocatalytic process method for promoting the synthesis of peracetic acid by using anodic oxygen as claimed in claim 8, wherein An anode chamber liquid storage tank, a product liquid storage tank, a product pump, and an anode chamber circulation pump are additionally provided. The product pump enables the acetic acid in the cathode chamber to circulate rapidly or flow continuously and slowly, increasing the concentration of peracetic acid in the solution. The anode chamber circulation pump continuously adds electrolyte to the anode chamber (5) to prevent the liquid level from dropping due to long-term electrolysis.

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